Which of the following can be determined by using the Doppler effect I.the speed at which a star is moving away from an observer
II)the transverse velocity of a star
III)the radial velocity of a star
IV)the speed at which a car is traveling toward an observer
A)I & IV
B)II & III
C)II & IV
D)I & III
E)I, III, & IV

Question

Quizplus · Accepted Answer

The Doppler effect can be used to determine the speed at which a star or any object (like a car) is moving towards or away from an observer, which includes scenarios I, III, and IV. It does not directly provide information about the transverse velocity (II) of a star, as the Doppler effect is concerned with radial velocities (towards or away from the observer), not velocities perpendicular to the line of sight.

Which of the Following Can Be Determined by Using the Doppler